Marine Weather and TidesMount Laguna, CA

Version 3.4

What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:19AM

Sunset 4:44PM

Monday November 19, 2018 3:38 PM PST (23:38 UTC)

Moonrise 3:54PM

Moonset 3:34AM

Illumination 90%

NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.

PZZ700 127 Pm Pst Mon Nov 19 2018 Synopsis for the far southern california coast.. At 2 pm, a 1028 mb high was over northern utah and a 1016 mb low was over the california bight. Weak onshore flow will develop in the afternoons early this week, with stronger onshore flow later this week. Gusts near 20 kt are expected Friday into Saturday, mostly over the outer waters. Showers will be possible at times Wednesday and Thursday.

Synopsis
Low pressure off the coast will bring a mostly cloudy afternoon,
then drift across the region on Tuesday, helping to deepen the
marine layer, along with more low clouds and some cooling. Another
weakening trough will follow Wednesday night into Thursday. This
system could generate some light rain and showers along and west of
the mountains beginning sometime Wednesday night and continuing into
Thursday. Another system could generate some light shower activity,
mainly for san diego county on Saturday, followed by a return of dry
offshore flow and warming early next week. It will be gradually
cooler through thanksgiving day, then warmer into the weekend.

Discussion For extreme southwestern california including orange...

san diego... Western riverside and southwestern san bernardino
counties...

it was another very mild day across socal, even with high clouds
filtering the sun. Surface pressure gradients were still around 7
mbs offshore (sw nv to ksan) supporting easterly wind gusts of 25-30
mph along the coastal slopes and foothills at noon pst.

Satellite imagery shows the weak upper low centered about 500 miles
west of san diego and headed east. A thick band of high clouds was
spreading east ahead of it this afternoon. This weak feature will
drift across socal on Tuesday helping to build the marine layer and
increase the very low humidity levels inland.

Following the weak weather system on Tuesday will be a more broad
trough. This feature will gather a significant amount of pacific
moisture and create widespread rain across central and northern
portions of the state. The system will be weakening as it comes east
though, and that leaves socal in an areas of decreasing dynamics to
produce rain. Still, it looks like there will be enough energy and
moisture with it for a period of light rainfall here. At this time
amounts are expected to remain mostly below one-half inch, but some
of the wetter coastal slopes of the mts could see a bit more before
all is said and done.

The weather will quickly dry later Thu thu night, and Friday should
be dry and cool. A stronger trough will drop south inland on
Saturday, lifting the marine layer and possibly generating some
light precip west of the mts on Saturday. Following this system, our
sfc winds will turn back offshore and may get gusty in some of the
wind-prone areas. This will bring a drying and warming trend late in
the holiday weekend. Overall, temperatures will be running a bit
below average until Sunday when areas west of the mts warm to above
average.

Hydrology
The forecast rainfall across socal is not expected to produce any
heavy runoff or flooding at this time. Rainfall rates in general,

are expected to be one-tenth of an inch per hour or less at lower
elevations. At this rate any runoff will be limited, except on
impermeable surfaces such as roadways. Precipitable water values are
forecast to be over one inch, so there is plenty of moisture
available in the atmosphere, but instability and lift are very
limited. This combination favors the coastal mtn slopes for the
heavier rates amounts, where upslope flow can enhance the rainfall
rates a bit. Amounts will be limited by the duration of the event as
well, which should move through rather quickly. Rainfall totals of
one-tenth to one-quarter inch at lower elevations west of the
mountains, and one-quarter to three-quarters of an inch on the
coastal mtn slopes looks possible. For the deserts... Just a few
hundredths of an inch. A few inches of snow could fall above 7500 ft
in the san bernardino and san jacinto mts as well.

Aviation
192130z... Coast valleys... Low stratus will return to coastal areas
08z, with bases 1,200-1,500 ft and tops to 1,800 ft. Coastal taf
sites may oscillate between sct and bkn CIGS overnight. Clouds will
extend 15 mi inland locally, and result in vis 2-4 sm in br with
patches of fg in higher terrain obscured by clouds. Clearing should
occur by 18z tue, although sct-bkn high clouds above 20,000 ft will
persist through the period. Stratus will return Tue night with
higher bases and greater inland coverage.

Marine
No hazardous marine weather is expected through Thursday. Wind gusts
near 20 kt are possible Friday into Saturday, mainly across the
outer coastal waters.

Fire weather
Easterly winds were still gusting 25 to 30 mph along the coastal
slopes and foothill areas at midday with rh values at 15% or less.

The winds have peaked and should decrease slowly through the
afternoon, but fire weather conditions will remain elevated through
the day.

Tonight through Tuesday... Winds will remain from the east, but
weaken, and slightly better rh recovery is expected. For Tuesday,
onshore flow will gradually build inland, along with rh levels. A
wetting rain could arrive late Wednesday night or Thursday but
rainfall amounts will be light.

Weather Map and Satellite Images

(on/off) &nbspHelpWeather MapGOES Local Image of SouthwestEDITNOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.Link to LoopOther links:
Northern PacificContential USFull GOES-East

Wind Forecast for San Diego, CA (18,4,5,8)

Disclaimer:The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.